WeatherHawk WM-300 WindMate Hand-Held Weather Meter, Blue This comprehensive instrument measures wind speed and direction w/ cross with head/tail wind, temperature, relative humidity, wind chill, dewpoint, wetbulb and delta T. This wind meter comes with two year warranty and a lanyard Jackknife case protects and functions as handle, along with wind vane improves user accuracy, replaceable non-corroding impeller Water resistant, tripod fitting, wind vane, auto shutoff feature, fluxgate digital compass, thermometer, back light and uses replaceable lithium battery Measures wind 0.1 to 89 MPH, measures average and maximum wind speed over 10 second intervals, calculates cross wind, head wind, tail wind, measures temperature, wind chill and wind direction using digital compass Measures current, average, maximum wind speed in MPH, KMPH, MPS, FPM, BF and KNT, measures temperature degrees in F or C, compass reads in direction points and degrees